Not every pipe that sticks out of a roof is an alarm or an invitation for maintenance—but most are. In many homes, the most common rooftop protrusion is a plumbing vent: a small-diameter pipe that allows sewer gases to escape and helps plumbing drain without siphoning water out of traps.

These vents are typically routed through the attic and terminate above the roofline to stay clear of blockages caused by moisture and condensation. When they function correctly, sinks, showers, and toilets drain smoothly and the home maintains safer, more stable pressure in the waste system.

Why plumbing vents matter

As water flows down drain lines, it creates pressure changes. A vent stack equalizes that pressure so drains don’t “glug,” slow down, or cause gurgling. It also reduces the likelihood of sewer odors backing up indoors by providing an outlet for gases.

In practical term ... Read more »

Every flush sends a mix of water, human waste, toilet paper, and household wastewater into the city’s plumbing network. From there, what happens next depends on where you live, but the overall process is designed to move sewage safely and treat it before it reaches the environment.

First stop: the sewer or septic system

In many cities, wastewater flows through underground pipes called sewers. In areas not served by centralized sewer lines, homes may rely on septic systems instead, where waste is treated on-site. Either way, the water is collected and transported to the next stage of treatment.

Centralized sewer systems

Most municipal sewer systems are “gravity-fed,” meaning wastewater moves downhill through pipes. If your neighborhood is flat or higher than the treatment plant, pumping stations may transfer sewage to the next section of the network. Alon ... Read more »

Stories about rats “coming up through the toilet” sound shocking, but they’re not pure fantasy. Rats are skilled climbers and can travel through underground spaces, sewer systems, and plumbing pathways—meaning that, under the right conditions, a rat could end up near a toilet or even enter through plumbing.

The key question is not whether the scenario is dramatic, but whether the home has the specific vulnerabilities that would make it possible.

How rats could reach a toilet

Toilets connect your indoor plumbing to the building’s drain line and, ultimately, the sewer or septic system. If a rat can get into the drain pathway (for example, from the sewer line, crawl space, basement, or outdoor access points), it may be able to move within the piping. In some cases, it can position itself near a fixture opening or find a route upward if there are openings, breaks, or poorly sealed conn ... Read more »

Drain systems in multi-unit buildings face heavier and more frequent use than many single-family homes. Without a structured maintenance plan, common problems—like slow drains, recurring clogs, foul odors, and sewage backups—can escalate quickly across units, hallways, and shared common areas.

This guide is designed for property managers and building operators who want a repeatable, documented approach to keeping main drains, venting, and unit-level plumbing functioning reliably while reducing disruption to tenants.

1) Start with a building drain map and baseline assessment

Before scheduling work, inventory your drainage infrastructure. Identify key components such as main stack(s), cleanouts, floor drains, sump pits (if applicable), interceptor drains, roof drains, and vent lines. Then document how drainage is connected from units to common piping and where access points exist for inspection and ma ... Read more »